Electric switch



Dec. 15', 1931. A, R 1,837,111

' ELECTRIC SWITCH Filed March 27, 1928 2 Sheets-Sheet 1 Joy/V19 JZZZZZJOM INVENTOR ATTO R N EY Dec 15,1931. J A CARSQN L837J11 ELECTRIC SWITCH iled March 27, 1928 2 Sheets-Sheet 2 Jlzico 2 19 1e 24 BY 611M141 WITNESSzM ATTORNEY Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE JOHN A. CARSON, OF HUNTINGTON, NEW YORK ELECTRIC SWITCH Application filed March 27, 1928. Serial No. 265,146.

or turned oif by means of a control key in the hands of an authorized person.

With these and other objects in view, the invention resides in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fullydescribed, are particularly pointed out in'the appended claims, and are illustrated in the accompanying drawings, in which Figure 1 is a horizontal sectional view 2;; through a burglar alarm casing showing the present switch; I

Figure 2 1s a vertlcal sectional view through the burglar alarm casing, looking toward one,

side of the latter;

Figure 3 is a sectional elevational view of the circuit control switches: and

Figure 4 is a diagrammatic view of certain electrical circuits incorporating the present improvements.

Referring to the drawings by reference characters, the numeral designates a boxlike burglar alarm housing hingedly mounted upon a panel 11 adapted to be mounted upon a wall or like supporting structure within reach of a person, as shown in Figure unauthorized persons. Mounted on the inside of the front wall of the housing is a key controlled lock mechanism 13 which is accessible for operation from the outside by passing a key 14 through a key hole slot 15 in the housing. The lock mechanism 13 includes a slid able bolt 16 which is movable beyond opposite sides of the lock housing to respectively engage electric contact switches 17 and 18. The switches 17 and 18 are carried on the inside of the front wall of the housing in a plane even with the sliding bolt 16. The switch 17 includes a stationary flat contact 19, while a flat spring contact is mounted in spaced relation thereto and has a contact point for engagement with the contact 19 when the bolt 16 is moved to a retracted position. The free end of the contact 20 extends beyond the adjacent end of the contact 19 and is bent angularly as at 21 to provide bolt engaging portions.

The switch 18 includes a stationary fiat contact 22 with which a flat spring contact 23 engages when the bolt 16 is extended into engagement with the angularly bent end 24.

The normal tendency of the spring contact 23 is to move away from the contact 22.

Supported by the panel 10 is a shelf 25 for supporting a plurality of dry cells which constitute a battery 26 for supplying current to the several circuits for the burglar alarm.

Also supported on the panel 10 are relays 27 and 28. The relays include armatures 29 and .30 respectively for actuating spring tongues 31 and 32 to cause them to engage spring contacts 33 and 34. The relays 2'7 and 28 when energized serve to close certain circuits through the sets of contacts 31 and 33, and 32 and 34 which in reality constitute switches A and B.

In this instance the switch 17 is arranged in and controls what I shall term a house circuit C while the switch 18 is arranged in and constitutes an alarm circuit D. Arranged within the house circu t C is the battery 26, a wire 38 from which leads to the contact 19. A wire leads from the other contact 20 of the switch 17 and. is led around the windows and doors to be protected, the same being indicated by the numc circuit is completed. about the windows and doors by lining the same with foil as is the usual custom whereupon opening of a window or door will cause the breaking of the foil. and consequently the breaking of the cir cuit C. The wire 39 leads to the coil of the relay 27, while a wire 41 from the relay is joined to a wire 42 which returns to the battery. This constitutes the house circuit and the authorized person turns the key 14 to a position to cause the bolt 16 to move from is'part ofthe alarm circuit. A wire 43 leads from thecontact 31 to thecontact 22 of the switch 33 and connects with the wire38 on one side of the battery 26. The other contact 23 of the switch 18has a wire 15 connected therewith which is connected with th wire 12 on the side of the battery opposite to that to which the wire l-i leads. The con 'tacts 52 and 3 1- of the switch B are respectively connected to the wires 48 and 4 1 by wires 16 and 47. A wire 48 leads from the relay or drop 28 to the wire while a second.

7 wire 19 leads therefrom and which is'acorr taneous operation when the circuittinuation of the wire 42 h :etofore mentioned The electric lamp 36 'andelectric bell 3? are tapped into the wires 12 and 4:5 for simi is broken in manner to be now explained.

It hasalready been explained that when theswitch 17 is closet. the relay 2'? causes the opening of the switch A. whereas manual [closing-of the switch lscausesthe alarm cir- 'cuit to beset for operation. The closing of the switch 18 does not affect the normal open positionof-the switch B which must be closed to close the entire alarm circuit through the bell, lamp, batteryg'and relay '28 which must be energized through the closing of the switch A. r

' Assume that an attempt has been made by ajburglar to enter an establishment by fore-- ingthe opening of a window or door, which will cause the breaking of the'foil and con.-

sequently the opening of the house circuit C. V This causes deenergizmg of the relay. 27'

which allows the contact 31 tospring into engagement with the contact 33 closing the cire cuit through wire 1 1- to battery 26, through wires' l2, and 49 to relay 28,1thence through wires 1?, l5, switch 18, wire 13 to Contact 31 which causes energizing'of the relay 28, which attracts contact 82 to engage contact 34 which malntains the relay 28 in an energmed posi-J tion irrespective ofwhether the house circuit is again closed which would tend to open switch A. The bell and electric lamp being arranged in the same circuit as the relay 28 will operate so long as it is energized. To stop thealarm from SOUIlCllllf it is necessarv for the authorized person to insert the pr perlrey 14 into the lock 13 and movethe col When thedevice is in an unset position, the bolt-l6 1s-1n enga ement with the. con

L i l a 21 i 1 6 from engagementwith the contact of the sw1tch 18 to break the alarm circuit.

tact 20 of the switch 17 holding the same from engagement withthe contact 19 whereupon bot-h the house and alarm circuits are open and no current is passing therethrough, thus relieving strain on the battery when the device is not intended for operation. When set for operation the current is only passing through the primary or house circuit which requires but a small amount of current.

While I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the detailsmay be varied without in any way departing from the spirit of my invention and I therefore do not limit myself to the eXactdetails of construction herein set-forth nor to anything less than the whole of my invention limited only by the appended claims. v i i What is claimed as new is I V 1. In an electrical burglar alarm device,

'a pair of switches, each ofwhich includes a stationary contactand aspring contact, the spring contact of one switch tending to engage its co acting stationaryycontact while acting stationary contact and'key actuatedmechanism movableinto engagement with '90 the springcontact of the other switch tends I tornormally he in spaced relation to its co- I 2.1n combinationwitha pair of electric switches, each s'witchincluding a stationary contact and a co-acting. spring contact,'the spring contact of one switch tending toengage its 'co acting stationary contact while the spring contact of the other switch tends to normally lie in spacedrelation-to its coacting stationary'contact, a keyactuated lock embodying a housing, and a bolt slidablebeyond opposite ends of said housing for movement into alternate engagement with the respective movable contacts for actuatingithem against their spring tendencies substantialsaid firstterminal and .saidslidable bolt, whereby onslidmg movement of saidbolt' its end isefiective to contact with said in-' clinecl end for moving said inclined end latera'lly to flex said resilient contact and open the circuit. 7 1

. In testimony whereof 1 have ture. r r

JOHN a. caisson; 

